Abstract
The surface bonding technology is used to manufacture the BN@ZrO2 feedstock, and the YSZ, YSZ/BN, and YSZ/BN@ZrO2 abradable seal coatings are prepared to investigate the mechanical properties and abrasibility at room temperature, 800 ℃, and 1000 ℃. Results show that the porosity of YSZ/BN@ZrO2 is reduced to 12.24±1.25 %, the h-BN content is increased to 3.35±1.42 %, and the hardness is reduced to 3.24 GPa. The wear debris of YSZ/BN@ZrO2 is compressed to form a smooth “glaze” layer at the friction temperature reaching 1000 ℃, B2O3 produced by h-BN oxidation acts as a “sintering agent”, which improves the strength and stability of the “glaze” layer and dramatically improves the abrasibility of the YSZ/BN@ZrO2 coating (coefficient of friction: 0.3; incursion depth ratio: −64 %). Thus, YSZ/BN@ZrO2 coating with core-shell structured feedstocks has significant prospects in high-temperature abradable seal coating.
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